OK, so I'm dueling against a Specter: they played Possess and since I'm solo-ing my Earth spell must target myself.
Earth states "Target takes 2 DMG and you gain 2HP"
Since Earth is unresolved, I must take 3 DMG (+1 NV) but do I also heal +2 HP (+1 NV) or does the creature then increase +3 HP?
Earth just cancels itself out. Take 3 DMG and Heal 3 Hp = 0.